ino64 status report 8

[Gleb Kurtsou]

ino64 project aims at extending ino_t to 64 bits and nlink_t to 32 bits
integers providing compatibility shims for both kernel and libc.

Double buffering was removed from ufs_readdir, buffer cache is now used
directly. To prevent a readdir race when offset from previous readdir
becomes stale ufs dirrect's are parsed starting at DIRBLKSIZ boundary
(512 bytes). Skip entries with zero inode number.

NFS readdir offset and buffer size alignment was fixed: getdirentries()
call with not DIRBLKSIZ aligned offset and/or buffer size will result in
file offset that doesn't start on dirent boundary, i.e. next
getdirentries() call will return garbled result.

readdir-lint updated to better handle NFS' readdir output.